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When I get home I'll post a picture of the set-up I made. The trailer came with 2 batteries, and then I added 2 more on an isolator. The 2 additional batteries run 2 inverters, the Costco one like you have and a 2nd 800W that I installed in the storage compartment to run the TV.

Not quite as clean as yours due to smaller space and large battery cables, but functional.

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by KAYERIVERCITY:
.....what guage wire did you use?....looks like #6 in the pix....very small for any current to travel through if you have a big load......geofkaye </div></BLOCKQUOTE>

We,ll you made me go look at all my wires coming and going
to my batteries. Weekend Warrior uses #6 wires to their circuits
as well as link their two batteries in parallel.
I linked the added third battery in parallel
with #6 wire to the adjacent battery.

WW used one short length of heavier #5 wire to ground (battery to frame) on the negative
battery post closest to the right wall of the trailer.

Of course I used a 3 foot run of 4 AWG cable running from the center
battery to my 1500 Watt inverter.